Fire-fighters were called out to two suspicious fires in the same street.
The fires, which both occurred in Buck Street, off Coal Clough Lane, involved a garage and a wheelie bin.
A spokesman for the fire service said: “We believe that both fires were started deliberately.
“The first, which started about 8pm on Monday, was in a garage that was part of a small garage colony and not attached to a house.
“The second, around 6am the following morning, was in a wheelie bin.”